I’m not sure, Steyr is hard to get information from. I was told they would sell frames awhile back, still none, actually worse now the frames are serialized. I have also been told they will sell extra slides, but that hasn’t come yet either. I believe they said optics ready would be the next generation. I’m going to guess maybe they will offer a milling service for aftermarket optics? But I am not sure. Here is why, he says aftermarket so maybe not a from factory milled slide. Unless he is saying they will use a dovetail mount there really isn’t another way to offer a optic and not mill it.